Firefox 3.6.28 is the last version of the old Firefox and won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you install the latest Firefox if possible. This article goes over your upgrade options.

Get the latest Firefox

If you have Windows XP Service Pack 2 or 3, Windows Vista or Windows 7, you should install the latest Firefox from mozilla.org as soon as possible. For details, see:

• How to install Firefox on Windows

The latest Firefox has many new features and looks a bit different from Firefox 3.6. After you upgrade, these articles will help you get comfortable with the changes:

• Common questions after upgrading from Firefox 3.6
• Get started with Firefox - An overview of the main features

Options for older versions of Windows

Firefox 12 is the last version of Firefox that will work with Windows 2000, the original version of Windows XP or Windows XP Service Pack 1. If you use these versions of Windows you will have to update Windows in addition to Firefox in order to keep receiving security and stability fixes. For details and what to do if you can't upgrade, see:

• Firefox no longer works with some versions of Windows XP
• Firefox no longer works with Windows 2000

Get the latest Firefox

If your Mac has an Intel processor and Mac OS X 10.5, 10.6 or 10.7, you should install the latest Firefox from mozilla.org as soon as possible. For details, see:

• How to download and install Firefox on Mac

The latest Firefox has many new features and looks a bit different from Firefox 3.6. After you upgrade, these articles will help you get comfortable with the changes:

• Common questions after upgrading from Firefox 3.6
• Get started with Firefox - An overview of the main features

Options for Mac OS 10.4 or PowerPC processors

New versions of Firefox do not work with Mac OS X 10.4 or with PowerPC processors. You will have to upgrade Mac OS in addition to Firefox in order to keep receiving security and stability fixes. For details and what to do if you can't upgrade, see:

• Firefox no longer works with Mac OS X 10.4 or PowerPC processors

Firefox 3.6.28 is the last version of the old Firefox and won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you install the latest Firefox.

Get the latest Firefox

• See Update Firefox to the latest release for instructions.
• If you are unable to update, please see Install Firefox on Linux.

The latest Firefox has many new features and looks a bit different from Firefox 3.6. After you upgrade, these articles will help you get comfortable with the changes:

• Common questions after upgrading from Firefox 3.6
• Get started with Firefox - An overview of the main features